shelve vs reprieve

shelve is not a noun while reprieve is a noun.

Word	Noun	Adjective	Verb	Adverb
shelve	No	No	Yes	No
reprieve	Yes	No	Yes	No

As verbs, reprieve is a hyponym of shelve; that is, reprieve is a word with a more specific, narrower meaning than shelve:

shelve: hold back to a later time
reprieve: postpone the punishment of a convicted criminal, such as an execution

Other hyponyms of shelve include call, hold, suspend, probate, respite.

shelve (noun)	reprieve (noun)
	the act of reprieving; postponing or remitting punishment
	a warrant granting postponement (usually to postpone the execution of the death sentence)
	an interruption in the intensity or amount of something
	a (temporary) relief from harm or discomfort

shelve (verb)	reprieve (verb)
place on a shelf	relieve temporarily
hold back to a later time	postpone the punishment of a convicted criminal, such as an execution